We are animals, monogamy is not a part of humanity like it is in penguins.
Our penises reshaped over millenia of orgies just to get all the other guys cum out.
We are sluts of the animal world, like rabbits
It implies that there were enough guys getting sloppy seconds for dick shape to give a reproductive advantage.
While it could have been from a lot of free love in the ancient past, I suspect it's more likely much darker than that and the evolution of cuckolds is intertwined.
Which really makes you think, shouldn't longer-penised individuals have an reproductive advantage over short-penised people? Longer penises can scoop deeper in the couchhole to get out other people's jizz. Why hasn't the human race evolved such that every male had 20 cm (7.8 in) penises?
Why hasn't humanity evolved such that every male had 20 cm (7.8 in) penises?
Oh dear, no one tell him he got the short end of the genes..
Joking, of course.
I would assume penises didn’t need to evolve to be that long on average since vaginas are not that deep on average? So there would only be so much depth to reach in the first place. Possibly girth would also affect it - having a long noodle dick might mean no matter how deep you go, the penis might not be wide enough to effectively “scoop” it out.
Again assuming, but after a certain length (bottoming out), width would become more important
The longer the penis, the larger the fraction of women who will find sex with that person painful, and at some point the reproductive advantage of scooping out others' semen will be nullified due to the fact that no woman wants to sleep with you. I think I read that four inches is the length that most women find comfortable, but I don't remember where I read it.